About Java character encoding

package small test sample code ideas; 

Import java.io.CharArrayWriter;
 Import java.io.PrintWriter;
 Import java.io.UnsupportedEncodingException;
 Import java.util.Arrays; 

public  class on the string transcoding { 

    Private  static String printByteArray ( byte [] byteArray the) { 
    String javaForm = "signed in the Java representation:" + of Arrays.toString (byteArray the) + ";" ; 
    CharArrayWriter with CAW = new new CharArrayWriter with (); 
    the PrintWriter outs = new new the PrintWriter (CAW); 
    outs.print ( "hexadecimal representation (useful form):" );
    outs.print("[");
    for (int i = 0; i < byteArray.length; i++) {
        outs.format("0x%02X, ", byteArray[i]);
    }
    String hexForm = caw.toString();
    hexForm = hexForm.substring(0, hexForm.length() - 2);
    hexForm = hexForm + "]";

    return javaForm + hexForm;
    }

    private static void printStringCode(String str) {
    try {
        System.err.println("\"" + str + "\"编码如下:");
        System.out.println("\t(UTF-8): " + printByteArray(str.getBytes("UTF-8")));
        System.out.println("\t(UTF-16): " + printByteArray(str.getBytes("UTF-16")));
        System.out.println("\t(GBK): " + printByteArray(str.getBytes("GBK")));
        System.out.println("\t(GB2312): " + printByteArray(str.getBytes("GB2312")));
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    }

    return;
    }

    public static void main(String[] args) throws Exception {
     0xCE,0xD2 是'我'GBK character encoding
    ////Because Java compiler recognizes type byte indicates the maximum range of -128 to 127, but are larger than 127 0xCE and 0xD2
     // so these two numbers turned negative first deposited into byte type
     // (because the computer data is stored complement form, so as to keep the negative into a byte array, the data is actually stored binary 0xCE and 0xD2) 
    byte [] = getParam new new  byte [] {- (( byte ) (256L - 0xCE)), - (( byte ) (256L - 0xD2 ))}; 
    String value = new new String (getParam, "the ISO-8859-1"); // the copy GBK encoded data as 'I' word to a String object to 
    byte [] value.getBytes = b ( "the ISO-8859-1"); // data value string object copied to the byte array b. 
    string newValue = new new string (b, "GBK");// data array b manner GBK encoding transcoded into intra-coded form (GBK-> UTF-16) a string object 
    System.out.println (newValue); 

    printStringCode ( "I" ); 

    printStringCode ( " they " ); 
    } 
}